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1 Many heavy metals are toxic (to, for, at) animals and plants
2 The government has to impose stricter controls ___ the emissions and bring in tough legislation to deal ___ the problem.
3 Carbon monoxide, which is mostly produced ____ motor vehicles can, even __ small doses, cause sickness and a slowing ___ the reflexes.
4 The Principle of Sustainable Development is included ___ the Amsterdam Treaty of the European Union
5 The increased amount __ carbon dioxide __ the atmosphere is making it warmer.

1 Many heavy metals are toxic to animals and plants 2 The government has to impose stricter controls on the emissions and bring in tough legislation to deal with the problem. 3 Carbon monoxide, which is mostly produced by motor vehicles can, even in small doses, cause sickness and a slowing down the reflexes. 4 The Principle of Sustainable Development is included into the Amsterdam Treaty of the European Union 5 The increased amount of carbon dioxide in the atmosphere is making it warmer.